allery60 વિદ્યાર્થીઓના વર્ગમાં, 35 ને ગણિત ગમે છે, 30 ને વિજ્ઞાન ગમે છે અને 15 ને બંને ગમે છે. ફક્ત ગણિત ગમતું હોય તેવા કેટલા વિદ્યાર્થીઓ છે?
A15
B20
C25
D30
Answer & Solution
Correct answer: B. 20
ફક્ત ગણિત = n(Math) - n(Math ∩ Science) = 35 - 15 = 20.
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